Add custom err handler #207
Conversation
WalkthroughThe changes introduce a new error handling mechanism in the API, enhancing the way errors are managed across different components. A new type Changes
Poem
Thank you for using CodeRabbit. We offer it for free to the OSS community and would appreciate your support in helping us grow. If you find it useful, would you consider giving us a shout-out on your favorite social media? 🪧 TipsChatThere are 3 ways to chat with CodeRabbit:
Note: Be mindful of the bot's finite context window. It's strongly recommended to break down tasks such as reading entire modules into smaller chunks. For a focused discussion, use review comments to chat about specific files and their changes, instead of using the PR comments. CodeRabbit Commands (Invoked using PR comments)
Other keywords and placeholders
CodeRabbit Configuration File (
|
![coderabbitai[bot]](https://avatars.githubusercontent.com/in/347564?s=60&v=4){kind=small}
There was a problem hiding this comment.
Actionable comments posted: 2
🧹 Outside diff range and nitpick comments (1)
api/err.go (1)
20-29: Approve with suggestions: Enhance error handling inAsErrHandlerThe
AsErrHandlerfunction effectively wraps the customErrHandlerinto a Gin-compatibleHandlerFunc, which is a good approach. However, there are a few suggestions to improve the error handling:
Consider allowing for different status codes instead of always using 500. This could be achieved by either expanding the
ErrHandlertype to return both an error and a status code, or by implementing custom error types that include status codes.The return value of
ctx.AbortWithErroris discarded. Consider logging this error or handling it in some way, as it represents a failure to send the error response to the client.The current implementation doesn't use the custom error response format defined in
respondWithError. Consider using this or a similar approach for consistent error responses across the API.Here's a potential improvement:
func AsErrHandler(h ErrHandler) gin.HandlerFunc { return func(ctx *gin.Context) { err := h(ctx) if err != nil { status := http.StatusInternalServerError if se, ok := err.(interface{ StatusCode() int }); ok { status = se.StatusCode() } respondWithError(ctx, status, err) } } }This suggestion allows for custom status codes through error types, uses the existing
respondWithErrorfunction, and provides more flexible error handling.
📜 Review details
Configuration used: CodeRabbit UI
Review profile: CHILL
📒 Files selected for processing (3)
- api/err.go (1 hunks)
- api/server.go (1 hunks)
- api/server_routes.go (1 hunks)
🧰 Additional context used
🔇 Additional comments (4)
api/err.go (2)
18-18: LGTM: Well-defined error handler typeThe
ErrHandlertype is well-defined and aligns with the Gin framework's context-based approach. It provides a clear interface for error-handling functions, allowing for flexible error management across the API.
Line range hint
1-29: Summary: Solid error handling enhancements with room for minor improvementsThe introduced error handling mechanisms in
api/err.gosignificantly enhance the API's capabilities for managing and reporting errors. TheErrHandlertype andAsErrHandlerfunction provide a flexible and Gin-compatible approach to error handling.Key points:
- The
ErrHandlertype is well-defined and aligns with Gin's context-based approach.- The
AsErrHandlerfunction effectively wraps custom error handlers into Gin-compatible handlers.- There's room for improvement in error status code handling and response formatting.
Overall, these changes represent a positive step towards more robust error management in the API. Implementing the suggested improvements will further enhance the flexibility and consistency of error handling across the system.
api/server.go (2)
21-21: LGTM: Improved error handlingThe changes to the
Resolvefunction signature and the explicitnilreturns improve error handling and make the control flow more clear. This is consistent with Go's idiomatic error handling practices.Also applies to: 29-29, 32-32
21-35: Verify the impact on the rest of the codebaseThe changes to the
Resolvefunction signature and behavior might require updates in other parts of the codebase that call this method or depend on its error handling.Let's run a script to check for potential impacts:
Please review the results of this script to ensure that all necessary updates have been made and that error handling is consistent throughout the codebase.
✅ Verification successful
Impact Verification Successful
The changes to the
Resolvemethod affect onlyapi/server.go:25, and there are no indications of broader impacts on the rest of the codebase.🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash # Description: Check for usages of the Resolve method and potential impacts # Search for Resolve method calls echo "Searching for Resolve method calls:" rg -n "\.Resolve\(" --type go # Search for respondWithError function to ensure it's still used elsewhere echo "\nChecking if respondWithError is still used:" rg -n "respondWithError" --type go # Search for AsErrHandler to see how it's implemented echo "\nChecking AsErrHandler implementation:" rg -n "func AsErrHandler" --type goLength of output: 1545
| default: | ||
| respondWithError(ctx, http.StatusInternalServerError, err) | ||
| return err |
There was a problem hiding this comment.
Consider the implications of removing respondWithError
By directly returning the error instead of calling respondWithError, we're no longer immediately responding to the client with an error status. This might lead to inconsistent error responses if not handled properly by the caller.
Consider one of the following options:
- Keep the
respondWithErrorcall before returning the error. - Ensure that the caller (likely the
AsErrHandlerwrapper) properly handles all error cases and responds to the client appropriately.
There was a problem hiding this comment.
Propose an alteration to AsErrHandler which makes use of a customer error type containing the error message and status to respond with.
There was a problem hiding this comment.
Certainly! Here's an updated version of AsErrHandler that uses a custom error type containing the error message and status code:
// Define a custom error type
type HTTPError struct {
StatusCode int
Err error
}
func (e *HTTPError) Error() string {
return e.Err.Error()
}
// Update AsErrHandler to handle the custom error type
func AsErrHandler(h ErrHandler) gin.HandlerFunc {
return func(ctx *gin.Context) {
if err := h(ctx); err != nil {
// Check if the error is of type *HTTPError
if httpErr, ok := err.(*HTTPError); ok {
ctx.AbortWithError(httpErr.StatusCode, httpErr.Err)
} else {
ctx.AbortWithError(http.StatusInternalServerError, err)
}
}
}
}Then, in your handler functions like Resolve, you can return an *HTTPError with the desired status code and error:
func (s *Server) Resolve(ctx *gin.Context) error {
domain := ctx.Param("domain")
name := ctx.Param("name")
target, err := s.resolver.Resolve(domain, name)
switch {
case err == nil:
ctx.Redirect(http.StatusFound, target)
return nil
case errors.Is(err, app.ErrNotFound):
return &HTTPError{
StatusCode: http.StatusNotFound,
Err: err,
}
default:
return &HTTPError{
StatusCode: http.StatusInternalServerError,
Err: err,
}
}
}This approach allows AsErrHandler to respond with the appropriate HTTP status codes based on the custom error returned by your handlers, ensuring consistent and flexible error handling.
✏️ Learnings added
Learnt from: fabiante
PR: fabiante/persurl#207
File: api/server.go:34-34
Timestamp: 2024-10-20T10:36:41.825Z
Learning: In the `api/err.go` file, when using `AsErrHandler` in the Gin framework (Go), prefer using a custom error type (`HTTPError`) that contains the status code and error message to respond with, allowing for consistent and flexible error handling.
Note: Learnings are effective only in the context of similar code segments. To apply general coding guidelines, please configure review instructions. You can manage existing learnings in the app.
| @@ -30,7 +30,7 @@ func SetupRouting(r gin.IRouter, s *Server) { | |||
|
|
|||
| resolve.Use(validDomain, validName) | |||
|
|
|||
| resolve.GET("/:domain/:name", s.Resolve) | |||
| resolve.GET("/:domain/:name", AsErrHandler(s.Resolve)) | |||
There was a problem hiding this comment.
💡 Codebase verification
Approve and Recommend Expanding Error Handling Consistency
The modification to wrap s.Resolve with AsErrHandler effectively standardizes error handling for this endpoint, enhancing consistency in error responses.
Recommendations:
- Extend
AsErrHandlerUsage: Apply this error handling pattern to other route handlers (e.g., in admin and system groups) to ensure uniform error management across the API. - Update Documentation: Revise the API documentation to outline the standardized error responses provided by
AsErrHandler, aiding developers in understanding and utilizing the error handling mechanism effectively.
🔗 Analysis chain
Approve change and suggest consistent application
The modification to wrap s.Resolve with AsErrHandler is a good improvement for standardized error handling. This change likely enhances error reporting and handling consistency for the resolve endpoint.
Consider the following recommendations:
- Apply this pattern to other routes (e.g., in the admin and system groups) for consistency across the API.
- Update the API documentation to reflect any changes in error responses that may result from using
AsErrHandler.
To ensure the change doesn't introduce unexpected behavior, please verify the following:
- The implementation of
AsErrHandlerinapi/err.go. - The impact on API responses, especially for error cases.
You can use the following script to check the AsErrHandler implementation and its usage:
This will help ensure that the error handling is implemented correctly and used consistently.
🏁 Scripts executed
The following scripts were executed for the analysis:
Script:
#!/bin/bash
# Description: Check AsErrHandler implementation and usage
# Check AsErrHandler implementation
echo "AsErrHandler implementation:"
rg -A 10 "func AsErrHandler" api/err.go
# Check AsErrHandler usage across the codebase
echo "\nAsErrHandler usage:"
rg "AsErrHandler\(" api/
Length of output: 500
Summary by CodeRabbit
New Features
Bug Fixes
Documentation